636405247347 has 8 divisors (see below), whose sum is σ = 849566379456. Its totient is φ = 423757140072.

The previous prime is 636405247321. The next prime is 636405247397. The reversal of 636405247347 is 743742504636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 636405247347 - 2⁸ = 636405247091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 636405247347.

It is not an unprimeable number, because it can be changed into a prime (636405247307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128253313 + ... + 128258274.

It is an arithmetic number, because the mean of its divisors is an integer number (106195797432).

Almost surely, 2^636405247347 is an apocalyptic number.

636405247347 is a deficient number, since it is larger than the sum of its proper divisors (213161132109).

636405247347 is a wasteful number, since it uses less digits than its factorization.

636405247347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256512417.

The product of its (nonzero) digits is 10160640, while the sum is 51.

The spelling of 636405247347 in words is "six hundred thirty-six billion, four hundred five million, two hundred forty-seven thousand, three hundred forty-seven".